Jochen_145 wrote:What is the differnce between normal SubaruCAN ?In configuration, I cannot see any, what am I missing ?

CAN fast requires that you check the patch in EcuFlash at the bottom after loading up your ROM. It enables logging of RAM parameters (the ones that start with 0xFF) in your logcfg.txt. It also compresses the 4 byte parameters (RAM params) into 3 bytes in the request hence enabling "fast" logging.